Chapter 2 — Architecture Overview High-Availability Configurations
December 2019 User Guide—Spectra T200, T380, and T680 Libraries
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Controller Failover
The BlueScale Controller Failover feature uses two RIMs or F-QIPs that are
configured as a failover pair. RIMs and F-QIPs can be mixed in a failover
pair; a RIM2 can only be in a failover pair with another RIM2.
One controller in the pair is the primary controller and the other is the
secondary controller. From the host perspective, the primary controller is
the only controller present. The secondary controller is not visible to the
host.
Figure 31 shows a simplified view of how the failover pair operates. Port A
on each controller in the pair is connected to the same Fibre Channel
switch. Both ports have the same configuration, except that the primary
operates in target mode and the secondary is not active.
The two controllers use the library’s internal communication bus to
monitor each other and to maintain a cache of the library’s inventory
database.
Figure 31 Paired controllers configured to provide failover
redundancy.
Primary Controller
A
B
SAN
Secondary Controller
A
B
Before failover
Primary Controller
A
B
SAN
Secondary Controller
A
B
After failover
Robotic control path (target port)
Internal communication bus (mirror inventory & partner monitor)
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